The Court of Appeals for the District of Columbia Circuit upheld the agency's decision to not implement new nitrogen oxide and sulfur oxide rules to prevent acid rain, beating back a green group’s claim that the agency is obligated to set the new standards.

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EPA considered a complex algorithm for pollution limits tailored to specific regions, but concluded that it didn’t have the science to prove that it would work.

The Supreme Court, meanwhile, refused to take appeals from circuit courts in Oklahoma and North Dakota on haze limits set by EPA. The lower courts in those cases deferred to EPA’s calculations.

Such deference afforded to the EPA may be useful if other rules that President Obama has prioritized, like greenhouse gas limits for existing power plants due to be released next week, are challenged.

CARBON REGS: On Wednesday, opponents and advocates will start to rally people to their cause ahead of the EPA's most forceful proposal under President Obama to act on climate change.

On Monday, the EPA is expected to unveil the nation's first carbon emissions limits for existing power plants, but not before industry and green groups have a say.

The U.S. Chamber of Commerce's Institute for 21st Century Energy will release a new report on Wednesday that assesses the impact of the coming carbon regulations.

Later on Wednesday, Earthjustice will host a call with a number of groups that support the coming EPA rule for existing power plants. The national leaders on the call will bolster their case for carbon pollution limits, and call the coming proposal the "most effective action to curb climate pollution in history."

President of the National Latino Coalition on Climate Change, Mark Magana, and director of advocacy for the Evangelical Lutheran Church in America, Stacy Martin, will participate in the discussion.

TransCanada shot back at the report. In a press release Tuesday, the Keystone XL pipeline developer said that the addition of two more conditions on the State Department's final environmental statement "was anything but 'quiet.'"

"All of the issues that TransCanada identified and voluntarily reported to PHMSA have been addressed. Every one of these weld defects was either repaired or cut out entirely. After significant investigation following the Warning Letter, PHMSA determined that the project met all codes and special conditions and could proceed to operation," TransCanada said in a statement.

Still, green groups blasted TransCanada Tuesday for the two additional conditions needed for the pipeline, which has yet to be built. They considered the conditions another tally in the long list of reasons Keystone XL is not safe, or in the nation's best interest.

Nuclear...A report from the Department of Energy’s (DOE) Office of Inspector General (OIG) faulted DOE and its National Nuclear Security Administration for not properly heeding warnings that the cost of its plutonium-processing facility in South Carolina would increase drastically.

The Tuesday audit report called for new measures to rein in the costs of the mixed-oxide fuel (MOX) facility and clamp down on management through the facility’s contractor, MOX Services.